Hi Patrick,
To de-embed three fixtures or pads from your Device Under Test (DUT) using MATLAB's 'deembedsparams' function, which is originally designed for two-port networks, you can follow an iterative, step-by-step approach. Here’s a possible strategy:
- Obtain the S-parameters for each of the three fixtures or pads individually.
- De-embed the first fixture/pad from the DUT combined with all fixtures/pads.
- De-embed the second fixture/pad from the result of the first step.
- Finally, de-embed the third fixture/pad.
- The sequence of de-embedding might affect accuracy; choose it based on the physical and electrical configuration.
- Ensure high accuracy in the S-parameters of each fixture/pad.
- Validate your final de-embedded S-parameters against direct measurements or simulations if possible.
This approach relies on the assumption that the effects of the fixtures/pads can be independently and sequentially de-embedded, which may not hold in more complex RF systems. Accuracy and validation are crucial throughout this process.
